Screw-machine



No. 748,667. PATENTED'JANQE, 1904. G; SITTMANN &,W H. PITT.

SCREW MACHINE.

APPLICATION FILED SEPT. 10, 1901.

NO- MODEL.

w: scams PEI'ERS co mom-Luna. WAiNINGTON. a, c.

' STATES Patented January 5, 1904.

PATENT OFFICE.

GUSTAV SITTMANN AND WALTER H. PITT, OF BROOKLYN, NEW YORK.

SCREW-MACHINE.

SPECIFICATION forming part of Letters Patent No. 748,667, dated January 5, 1904.

I Application filed September 10, 1901- Serial No. 74,876. (No model.)

To all whom, it may concern..- 7

Be it known that we, GUSTAV SITTMANN and WALTER H.PITT,citizens of the United States, and residents of New York city, borough of Brooklyn, State of New York, have invented certain new and useful Improvements in Screw-Machines, of which the following is a specification.

' Our invention relates to improvements in means for operating the devices that feed stock to the tools in screw-machines and the like; and the object of our invention is to provide simple and efficient devices whereby the length of stock to be fed to the tools can be varied as may be required and wherein adjustment' can be made for varying the feed without stopping the machine; and to these ends our invention comprises the novel details of improvement that will be more fully hereinafter set forth and then pointed out in the'claims.

Reference is to be had to the accompanying drawings, forming part hereof, wherein s Figure 1 is a side view of a portion of a screw machine embodying our improvements. Fig. 2 is an end view thereof. Fig. 3 is a central section through the stock receiving tube and surrounding parts.- Fig. 4 is an inverted plan view of the reciprocative stock-feeding sleeve or block. Fig. 5 is a plan view of the same. Fig. 6 is an end view of the same looking from the left in Fig. 1. Fig. 7 is a similar view looking from the right in Fig. 1, and Fig. 8 is a detail perspective view of the levervor swinging arm of said sleeve.

Similar numerals of reference indicate corresponding parts in the several views.

The numeral 1 in the accompanying drawings indicates a portion of a suitable frame, and 2 is a driving shaft carrying a camwheel 3.

4 is a tube or shaft adapted to receive stock in lengths to be fed, and said tube is provided at the outer end with a head 4*, having an annular groove 4, and to said tube any suitable stock-clamping jaw or the like may be fitted.

5 is a tube surrounding the tube 4 and which may be provided at one end with a clamping-jaw to coact with a chuck carried tube 6. From ring 8 a pin 8* projects through a slot 9 in tube 6 and is secured in tube 5.

The levers 7 are pressed outwardly by a spool 10, having a beveled face and which is mounted to slide upon tube 6 and is shown pro vided with an annular groove 10 to receive a shifter. When the lovers 7 are pressed outwardly, their shoulders engage head 6, and thereby ring 8 is moved forwardly, and pin 8 pushes tube 5, so that its jaw coacts with the chuck and grips the stock projecting from the tube 4. The spool 10 is reciprocated by means of a sleeve 12, mounted to slide, as upou a guiding-rod 13, projecting from frame 1, said sieeve having a fork 12 to engage the groove of said spool, and the sleeve 12is to be reciprocated by cam 14 on cam-wheel 3 in the usual or well-known manner and is shown provided with a wear-piece 12 to be engaged by said cam.

All of the foregoing parts may be of suitable or usual construction and are shown to illustrate the connection of our improvements, with means for gripping stock while it is being fed, and for a more detailed description of the foregoing parts and of gripping-jaws or chucks to be used therewith reference is made to Letters Patent N 0. 671,568,

issued April 9, 1901, to Gustav Sittmanu.

Our improvements, as applied to the type of machines above described, are arranged as foliows: Upon the rod 13 is mounted a sleeve 15, provided withafork 15 to engage the groove 4 in head 4*. At its under side the sleeve 15 has a lug or stop 16 near one end, an extension 17 at the opposite end provided with a screw-threaded aperture to receive a screw 18, and also with an extension 19, shown projecting at right angles to extension 17, although the form of the sleeve 7 to provide such extensions may be altered, if desired. At the under side of projection 19 a lever is pivoted, as by a screw or the like 20, the free end of said lever being adapted to swing between the stop 16 and screw 18. The lever 20 is shown provided with a wear-piece 21, which may be in the form of a rotative sleeve secured to the lever by a screw or the like 22, and said lever also has a projection 23, adapted to engage screw 18. v The lever 20 is to be oscillated between the lug or stop 16 and screw 18 through the medium of the wheel 3, and for this purpose we have shown said wheel provided with cams or the like 24 25, which may be adjustably held upon thewheel 3 by screws or in other suitable manner, and said cams are in Fig. 1 shown set at reverse angles upon the wheel in position to engage wear-piece 21, the relation of said cams being such as to reciprocate said wear-piece. The cams 24 are so placed that as wheel 3 rotates in the direction of the arrow in Fig. 2 the cam 24 will engage wear-piece 21 and cause the latter and lever 20 to move to the left in Fig. 1, and then the wear-piece 21 will be engaged by cam 25 and moved back, or to the right in Fig. 1, until said cam passes away continuously,) as indicated by dotted lines in Fig. 1, whereby lever 20 is oscillated horizontally. Now according to the adjustment of screw 18 the lever '20 can be rocked or oscillated more or less free of engagement with lug or stop 16 and said screw. When said lever engages lug or stop 16, the sleeve 15 will be moved to feed the stock, (to the right in Fig. 1,) and when the lever engages screw 18 the sleeve 1 will be moved back to causea new grip to be taken on stock.

As the lever 20 has free motion between lug l6 and screw 18 and as the distance that the lever can move between said lug and screw may be varied by the adjustment of said screw, it will be apparent that as lever 20 moves to the left in Fig. 1 it will engage screw 18 sooner or later, according to the distance said screw has been adjusted inwardly, so that if the screw has been adjusted fully inwardly the lever 20 will coact therewith to draw the sleeve 15 back to the full extent, and if the screw 18 has been adjusted inwardly but slightly the lever 20 will move freely .for a corresponding distance until it engages said screw and then will move the sleeve 15 a correspondingly short distance, and thus the movement of the sleeve will be more or less toward the left in Fig. 1, according to the independent swing of lever 20 permitted by screw 18, whereby the amount of feed of the stock is regulated, it being understood that the cam 25 swings the lever 20 the same distance at each rotation of wheel 3 and that thereby the movement of sleeve 15 to the right to feed the stock to the tools by the action of cam 25 is always the same. Thus by the means described a very accurate adjustment of screw 18 to cause feeding of the stock more or less is possible, and this adjustment of the screw can be eifected without stopping the machine.

It will be understood that to vary the feed of the stock it is not necessary during operation to adjust the cams 24 and 25. The cams 14 on wheel 3 will cause sleeve 12 to reciprocate at the proper time relatively to the reciprocations of sleeve 15 to cause a new grip to be taken upon the stock by the chucks or grippers connected with tubes 4 and 5 through the medium of spool 10, levers 7, &c., as more fully set forth in the patentabove referred to.

We do not limit our invention to the details of construction shown and described, as

they may be varied without departing from the spirit thereof.

Having now described our invention, what we claim is 1. A device of the character described comprising a tube to receive stock, a reciprocative sleeve connected with said tube and provided with stops, a movable member connected with said sleeve for reciprocating the same and movable between said stops, one of said stops being adjustable with respect to said member, and means for operating said member, substantially as described.

2. A device of the character described comprising a tube to receive stock, a reciprocative sleeve connected therewith and provided with stops, a cam-wheel, a movable member connected with said sleeve and movable between said stops to be operated by the cams for feeding, and means whereby the extent of movement of such movable member relative to the sleeve may be adjusted, substantially as described.

3. Adevice of the character described comprising a tube to receive stock, a reciprocative sleeve connected therewith, an oscillatory member connected with said sleeve, a stop for said member connected with said sleeve, an adjustable stop also connected with said sleeve between which stops said member is adapted to oscillate, and means foroscillating the said member, substantially as described.

4. A device of the character described comprising a tube to receive stock, a sleeve connected therewith, a lever connected with said sleeve, a pair of stops for said lever carried by said sleeve, one of which stops is adjustable relatively to said lever, and a cam-wheel adapted to operate said lever to feed said sleeve more or less, substantially as described.

5. Adevice of thecharacter described comprising a tube to receive stock, a reciprocative sleeve connected therewith, a lever carried by said sleeve, a stop carried by said sleeve at one side of the lever to be engaged thereby, an adjustable stop carried by said sleeve on the opposite side of the lever to regulate the movement of said lever independent of; said sleeve toward said stop, and a cam-wheel to oscillate said lever, substantially as described.

6. A device of the character described comprising aitube adapted to receive stock and provided with a head, a reciprocative sleeve having means to engage said head, a lever carried by said sleeve, a stop connected with said sleeve to be engaged by said lever, a screw carried by said sleeve to regulate the independent movement of said lever, a wheel, and cams on said wheel for oscillating said' lever, substantially as described.

7. A device of the character described comprising a tube to receive stock, a reciprocative sleeve connected therewith, a lever carried by said sleeve, a pair of stops carried by said sleeve on opposite sides of said lever, one of said stops being adjustable, a cameUs'rAv SITTMANN. WALTER H. PITT Witnesses:

HENRY M. WELLS, BERTHOLD LEINHARDT. 

